Gas burner for blast-furnace stoves or furnaces



W. R. PAULSEN Feb. 3, 1931.

GAS BURNER FOR BLAST FURNACE STOVES OR FURNACES 2 sheets-sheet 1 Filed Aug. 22, 1928 wVrNEss Es: Y

Feb. 3, 1931. I w, R, PAULSEN 1,791,011

GAS BURNER FOR BLAST FURNACE STOVES OR FURNACES Filed Aug. 22. 1928 2 Sheets-Sheet 2 l\ t t i? o ...ini/x CQ.. i. @l E: JFK

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MMI/,7.... l M@ Patented Feb. 3, 1,931

UNITED STATES PATENT oFFlcE I WILLIAM R. PAULSEN, O41? PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO AMERICAN HEAT ECONOMY BUREAU, F PITT DELAWARE GAS BURNER FOB. BLAST-FUR Application led August 22,

This invention relates to gas burners for blast furnace stoves or furnaces of that character, and more especially to a burner with which a deflecting baille is provided for effecting retardation and propel` mixing of the air and gas passing through the burner. Various types of burners forl injecting a mixture of gas and air into a-hot blast stove have heretofore been used. Where the gas and air are driven directly into the stove from the burner there has existed a difficulty in that with variationin pressure of gas and/or air, the combustion may take place at different parts of the stove. Sometimes; if the velocity of the air or gas is too great, unburned fuel may beY ,forced entirely through the stove, which results in loss of l fuel, and loss of heating effectiveness. Sometimes in the same way the combustion point 80 is driven too far into the furnace, and then suddenlyiiares back to or into 'the burner with an explosive force that is harmful to the mechanical structures. i

The present invention has for its primary object the provision of a retarding and mixing element adapted to be positioned directly in the path of the gas and air at the inlet to the stove, and to be movable with, or independently of the burner, for the purpose of retarding the iiow of gas and Vairat thepoint of admission tothe stove, and for thed purpose of so mixing and scattering the ases as to insure a more certain and unorm combustion, to prevent unburned gas from being 'driven through the furnace, as

well as to avoid Hare-back explosions due to the causes mentioned.

y Other objects will become apparent and a better understanding of the invention will i 4 be had when the following detailed 'description is .read in conjunction with the accompanying drawings, in which Fig. 1 is a. sectional view taken through the center of a rtion of a hot blast stove and a burner in which the preferred embodiment of my invention is incorporated' and Fig'g. 2 is a detail' drawing ofa deiiectmg bale and its su portin frame connected integrally with t le dooro the stove. 5. In practicing the invention a burner which SBURGH, PENNSYLVANIA, A CORPORATION OF- NACE STOVES OR FURNACES 1928. Serial No. 301,384. v

is adapted to be moved into`or out of an opening extending into the combustion chamber of a hot blast stove or furnace is provided for mixing and introducing blast furnace gas into the combustion chamber, and for insur'- ing the positive mixing of the gas and air as it passes through the burner a deecting baffle is provided which maybe secured in the outer end of theburner or positioned between the burner and stove when the burner is in operating position.

Referring now to the drawings a portion 1 of a combustion type of hot blast stove is shown. Extending into combustion chamber 2 of the stove is an inlet 3 which is located near the bottom of the stove and through which the mixed gas and air are introduced thereinto. A casing 4 is provided at t-he mouth of inlet 3 against which the outer endl of a burner may be placed, or in which a door 27 may be positioned to close the opening.

In the operation of hot blast stoves it is desirable that the burners be. made so that they may be moved into the inlet opening extending into the combustion chamber-when they are in `operation and out of it when they are not in operation. Burner 5 illustrated in the drawings is such a burner andcomprises a cylindrical outer tube 6 through which gas is passed into the stove. Fitted into an opening 7 at the outer end of this tube is a smaller concentric tube- 8 which is supported horizontally therein by means of bolts 10. Air necessary for supporting combustion in theburner is passed through tube 8, driven by a fan 9 mounted in the outer end of the tube. Any suitable means such as a turbine or electric motor, not shown, may be coupled to shaft 11 for driving the fan. f y .In the .lower side of tube 6 an elbow type ofoutlet 12 is provided for attaching tube 6 to sliding member 13, which rests upon staltionary member 14, forming the upper face of supportingframe 15'- Frame 15is provided in the usual manner with an opening in its central portion through` which the furnace gas is passed into the burner. A rack 16 is provided on the stationar plate 14 and a ear 17 mounted on a shaft 18'1ournalled in sli 100 member 13 is meslied therewith. Keyed to the shaft 18 is a large wheel 19 by means of which gear wheel 17 may be rotated to move the burner into and out of inlet 3 extending into combustion chamber 2. This type of burner and adjusting mechanism is so well known in the art that detailed description of it is deemed unnecessary.

To facilitate the positioning of door 27 in the opening at the end of inlet 3, when the burner is moved to its inoperative position, it may be sli'dably supported on a track 26'attaclied to the side of the stove by means of rollers 31 and 32 mounted in the upper ends of support members 33 and 34, respectively.

The usual practice is to introduce the gas into the burner through the outer tube and the air through the inner tube, but such practice may be and frequently is reversed. The purpose of arranging the air and gas tubes in the manner described is to cause the gas and air to become commingled as they pass from the burner. Where nol other provision is made for mixing the gas and air, if the injecting velocity of the gas and air becomes greater than the speed of the propagation of the flame, the mixture will tend to move along unburned until it reaches a point in the combustion chamber where the speed has been reduced enough to support combustion. The mixture will then ignite explosively and flare back to the burner. This explosion will be immediately followed by another as the process is repeated and the result `is a series of minor explosions in rapid succession which tend to loosen the refractory material in the stove, and in other Ways disturb its eiicient operation. Y

To overcome these disadvantages a deflecting baffle 21 is provided. This may be placed in the discharge end of the burner at the point where the gas is introduced into the inlet 3 of the stove. It may be attached to the vburner as shown in Fig. l, or made movable,

as shownin Fig. 2. Preferably the baille is made in the shape of a cone but it may take other suitable forms such as aflat disc, as shown in Fig. 2. A convenient way of mounting the deflecting baffle is to secure it in the center of a spider-like frame 22 and attach the frame to the outer end of tube 6 by means of bolts 23. In such a construction the baille is positioned immediately in front of the discharge end of the air inlet tube 8 so that as the air issues from this tube it will impinge against the baffle and be deected radially outward into the stream of the incoming gas and becomes thoroughly mixed with the gas as it enters the inlet leading into the combustion chamber of the stove. With the baie member mounted integrally with the burner it will be moved out of the inlet opening when the burner is moved out.

In some installations it is desirable to move the defiecting baille separately from the burnler and especially when it is adapted for use struts28 may be utilized to attach door 27 and frame 22a together. If so constructed,

yWhen the door is in its closed position the baiie will be in its inoperative position, and when the door is moved to its open position the baffle is moved into its operative position.

Accordingto the provisions of the patent statutes, I have explained the principle and operation of my invention and have illustrated and described what I now consider to represent its best embodiment. However, I desire to have it understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specilically shown and described.

I claim as my invention:

l. In combination with a gas burning furnace having a combustion chamber, a gas burner comprising an inner and an outer tube by means of which air and gas are passed through the burner, said burner being adapted to be moved into and out of position to supply gas and air, to the furnace combustion chamber, and a movable detlecting baille adapted to be disposed between the outer end of said burner and the combustion chamber when the burner ispositioned for o eration, whereby to deflect the fluid issuing iE-)rom one tube into, and causing it to be mixed with that issuing from thev other tube.

2. In combination with a gas burning furnace having a combustion chamber and a burner opening extending thereinto, a gas burner comprising an inner and an outer tube by means of which gas and air are passed through the burner, said burner being adapted to be moved into and out of said opening to supply gas and air to the furnace combustion chamber, and a deflecting baie movably mounted so that it maybe positioned in said opening between said furnace and said burner.

3. In combination with a gas burning furnace having a combustion -chamber and a. burner opening extending thereinto, a gas burner comprising an inner and an outer tube by means fo which gas and air are passed through the burner, said burner being adapted to be moved into and out of said opening to supply gas and air to the furnace combustion chamber, a movable deilecting baiiie for deflecting the Huid issuing from one of said tubes into and mixing it with that issuing from the other tu 4 said said baie being ada ted to be placed in the opening in said combustion chamber at the end of said-burner, a movable door for closing said opening. when said burner is not in use, and means connecting said baiiie and said door together whereby the two of them are moved with the same operation.

:4. The combination /with a gas burning' furnace having a combustion chamber and a burner opening extending thereinto,. a gas burner comprising an inner and outer tube through which gas and air are passed into the combustion chamber, manually operable means for moving said burner into and out of burner. opening, a detachable bale adapted to be arranged between the end of said burner and said burner opening to deflect 'the fluid issun from one of said burner tubes into that o the other toaid combustion, and a doorv for closin the burner opening when the burner is not 1n use, said door being operably connected to said baile lto permitl the movement of both of said elements with' a single operation.v

In testimony whereof, I sign m name.

IAM R. ULSEN. 

